fCONCHOLOGIST VOLUME XXXIX, No. 1 ISSN 0885-1263 QL 401 -T4Z INVZ MAY, 2003 The Texas Conchologist is the official publication of the Houston Conchol- ogy Society, Inc., and is published occasionally at Houston, Texas. It is distributed as part of the dues to all its members. The Society holds regular meetings the fourth Wednesday in each of the following months: August, September, October, January, February, March, April, and May. In November, the meeting is held the third Wednesday. An annual auction is held in place of the March or April Meeting Meetings are held at Southside Place Club House, 3743 Garnet, Houston, Texas. Meetings begin at 8:00 p. m. The Texas Conchologist is published October, and May. It is mailed postpaid to regular members in U.S. postal zones. Overseas members will be charged additional postage. Only one copy will be mailed to a family membership. Dues extend from the beginning of the fiscal year of June 1 through May 31. However, the May issue of the Texas Conchologist each year is the second issue due on the regular dues year beginning June 1 of the previ- ous year. Memberships will be accepted throughout the year but will receive issues of that fiscal year. Members receive meeting Newsletters and have all other privileges provided by the Society's by-laws. Rates and Dues Family membership $12.00 Single Membership $10.00 Student membership $ 6.00 Single issues $ 2.50 Extra sets mailed to members $10.00 (Postage for overseas members required) Subscription $12.00 (Seamail $5.00, Airmail outside U.S. $8.00) Co-Editor Co-Editor Darwin G. Alder Dr. John B. Wise 4250 W. 34" #103 Houston Museum of Natural Science Houston, TX 77092 Houston, TX 77030 713 682 6258 (713) 639-4677 Editorial Advisor Dr. Helmer Ode 3319 Big Bend Dr. Austin, TX 78731 (512) 452-7799 The Texas Conchologist accepts contributions for publication from amateurs, students, and professionals, subject to approval by the Editors. Manuscripts should be typed and double spaced, and should be in the hands of the Editors the first day of the month preceding publication dates. Photos accompanying articles are welcomed. TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, May 2003 The Texas Conchologist is getting a new Editor! lam stepping down as co-editor, after this edition, and placing the future of The Conchologist in the capable hands of Mr. Stephen Browning, with the invaluable assistance of Dr. John Wise. | have appreciated the chance to continue the fine and outstanding legacy of The Conchologist. | will still be involved with the Texas Conchologist, and to paraphrase Constance E Boone, long time editor of the Conchologist...’it was a Labor of Love” Darwin G.Alder A new Epitonium for Texas Roe Davenport This past winter, on my last trip to South Padre Island, Texas, | encoun- tered a large deposit of grass, shells and other beach drift along the shore. A sample from this deposit yielded numerous small shells. One of the more interesting shells is a small Epitonium, which resembles Epitonium rupicola. However, it is not that species because the shell’s ribs (costae) are curved near the top of each whorl and its color is differ- ent. After examining Weil, et al., (1999) and the original description for Amaea turnerae (Altena, 1971), it was determined that it is in fact this species. Interestingly, although Altena (1971) had 20 specimens at his disposal, he did not include a description of the shell’s initial whorls, which are absent in the holotype. The holotype is 11.0 mm in length, with 11 or 12 whorls, and damaged at the apex and aperture. The sheil is whitish with light brown bands at the sutures and body whorl. The South Padre specimen is 4.2mm in length with a brown protoconch of 2.5 whorls and an adult (=teleoconch) of 5.5 whorls. The body whorl has about 20 low, curved ribs, with a basal cord about the same size as the ribs. The ribs cross the base and are poorly developed. The nearly circular aperture has a thin outer lip, curving inward at the upper half and outward on the lower half. Altena, (1971) described Amaea turnerae from only Surinam. Weil, et al, (1999) also lists this species from south Florida, however, until now it l TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, MAY, 2003 has not been described from Texas. Acknowledgements: | would like to thank Darwin Alder for his help in identifying this species. Literature Cited: Altena, C. O., van Regterer, 1971. On six species of marine mollusca from Surinam, four of which are new, Zoologische Mededelingen, Leiden, Vol. 45, No. 5, 15 pp. 75-86. Weil, A., L. Brown and B. Neville, (1999) The Wentletrap Book, Guide to the Recent Epitontidae of the World, Arti Grafiche La Moderna, Rome. Photo from The Wentletrap Book, Guide to the Recent Epitoniidae of the World, Weil, et al., Plate No. 1, fig 3. 2 TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, May 2003 Species Checklist of Mollusks in the Seagrass Meadows of Redfish Bay, Texas Jennifer E. Davidson Center for Coastal Studies Department of Physical and Life Sciences Texas A& M University- Corpus Christi, Corpus Christi, Texas Sea grass beds provide essential habitat for many molluscan species. Ladd et al. (1957) and Parker (1959) provided general descriptions of Texas bays including Redfish Bay, providing lists of common mollusks; however, no studies have been done in this bay since the 1970's. In an examination of mollusks associated with different seagrass species near Stedman Island, the majority were located near Thalassia beds (Rickner, 1975). Zimmerman and Chaney (1969) determined that temporarily low- ered salinities as a result of Hurricane Beulah caused significant changes in mollusk distribution in the seagrass beds near Ransom Island. The following check list (Table 1) includes species encountered in Red- fish Bay from late fall 2000 to late summer 2001. A total of 26,498 individual mollusks were obtained from 520 biological samples. There were 61 identified species representing 36 families. Ten mollusks (5 bivalves, 5 gastropods) were identified only to genus. Individuals col- - lected included 35 species of bivalves from 15 families, 25 species of gastropods representing 17 families and one polyplacophoran. A study comparison list is included in Table 2, comparing this project's species list with other regional studies conducted over the last forty-five years. Twelve species (Caecum nitidum, Corbula contracta, Cyclinella tenuis, Henrya goldmani, Macoma pulleyi, Mercenaria campechiensis, Pinctada imbricata, Sphenia antillensis, Balcis jamaicensis, Tellina alternata, T. lineata and Turbonilla cf. interrupta) were found exclusively in this study. Of these, only. H. goldmani, M. campechiensis, S. antilllensis, and T. alternata were encountered more than once. Present molluscan abundance distributions in Redfish Bay grassbeds generally follow patterns found in previous regional studies. TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, MAY, 2003 REFERENCES: Castiglione, M.C. 1983, The distribution and ecology of the mollusks of Corpus Christi Bay, Texas, M.S. Thesis, Corpus Christi State University, Corpus Christi, Texas, 97 pp. Ladd, H.S., J. W. Hedgepeth, and R. Post, 1957. Environments and facies of existing bays on the central Texas Coast. Geol. Soc. Amer. Mem. 2:599-640. Parker, R.H. 1959. Macro-invertebrate assemblages of Central Texas coastal bays and Laguna Madre. Bull. Am. Assoc. Pet Geol. 43:2100-2166. Rickner, J.A. 1975. Seasonal variation of selected marine macro-fauna in a seagrass community bordering Stedman Island, Redfish Bay, Texas. M.S. Thesis, Texas A&l University, Kingsville, TX. 107 pp. Smith, E.J. 1985, Paleocologic aspects of modern macroinvertebrate communities of southern Laguna Madre, Texas. M.S. Thesis. Stephen F. Austin State University, Nacogdoches, Texas. 77 pp. Williamson, C.L\J, 1980 Population dynamics of mollusks in a seagrass bed surrounding a dredged material island, Upper Laguna Madre, Texas. M.S. Thesis, Corpus Christi State University. Corpus Christi, Texas. 81 pp. Zimmerman, R. J. and A. H. Chaney. 1969. Salinity decrease as an affector of molluscan density levels in a turtle grass (Thalassia testudinum Koning) bed in Redfish Bay, Texas. TAIUS 2:5-10. TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, May 2003 Table 1. Taxonomic list of mollusks identified in Redfish Bay, Texas, late fall 2000 - late summer 2001. PHYLUM MOLLUSCA Class Polyplacophora Order Neoloricata Family Ischnochitonidae Ischnochiton papillosus (C.B. Adams, 1845) Class Bivalvia Order Nuculoida Family Nuculanidae Nuculana acuta (Conrad, 1832) Order Mytiloida Family Mytilidae Amygdalum papyrium (Conrad, 1846) Brachidontes exustus (Linnaeus, 1758) Order Arcoida Family Arcidae Anadara ovalis (Bruguiere, 1789) Anaadara transversa (Say, 1822) Order Pterioida Family Pteriidae Pinctada imbricata Réding, 1798 Order Ostreoida Family Pectinidae Argopecten irradians (Lamarck, 1819) Family Anomiidae Anomia simplex d’ Orbigny, 1842 Family Ostreidae Crassostrea virginica (Gmelin, 1791) Order Veneroida Family Lucinidae Lucina pectinata (Gmelin, 1791) Parvilucina multilineata (Tuomey and Holmes, 1857) Family Lasaeidae Aligena texasiana Harry, 1969 Mysella planulata (Stimpson 1851) TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, MAY, 2003 Family Cardiidae Laevicardium mortoni (Conrad, 1830) Family Mactridae Mactrotoma fragilis (Gmelin, 1791) Mulinia lateralis (Say, 1822) Family Pharidae Ensis minor Dall, 1900 Family Tellinidae Macoma constricta (Bruguiere, 1792) Macoma pulleyi Boyer, 1969 Macoma tenla (Say, 1834) Macoma sp. A Tellina alternata Say, 1822 Tellina lineata Turton, 1819 Tellina tampaensis Conrad, 1866 Tellina texana Dan, 1900 Tellina sp. A Family Semelidae Abra aequalis (Say, 1822) Cumingia tellinoides (Conrad, 1831) Family Veneridae Anomalocardia auberiana (d’Orbigny, 1842) Chione cancellata (Linnaeus, 1767) Cyclinella tenuis (Rec1uz, 1852) Gemma gemma (Totten, 1834) Mercenaria campechiensis (Gmelin, 1791) Order Myoida Family Myidae Sphenia antillensis Dan and Simpson, 1901 Family Corbulidae Corbula contracta Say, 1822 Order Pholadomyoida Family Lyonsiidae Lyonsia hyalina Conrad, 1831 Family Pandoridae Pandora trilineata Say, 1822 TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, May 2003 Class Gastropoda Order Neritopsina Family Neritidae Neritina virginea (Linnaeus, 1758) Order Neotaeniog!ossa Family Cerithiidae Bittiolum varium (Pfeiffer, 1840) Cerithium lutosum Menke, 1828 Family Potamididae Cerithidea pliculosa (Menke, 1828) Family Vitrinellidae Vitrinella helicoidea C.B. Adams, 1850 Family Caecidae Caecum nitidum Stimpson, 1851 Caecum pulchellum Stimpson, 1851 Family Calyptraeidae Crepidula convexa Say, 1822 Crepidula plana Say, 1822 Family Naticidae Neverita duplicata (Say, 1822) Family Eulimidae Melanella jamaicensis (C.B. Adams, 1845) Order Neogastropoda Family Nassariidae Nassarius vibex (Say, 1822) Family Columbellidae Astyris lunata (Say, 1826) Costoanachis avara (Say, 1822) Family Conidae cf. Kurtziella sp. A Pyrgocythara plicosa (C.B. Adams, 1850) Order Heterostropha Family Ebalidae Henrya goldmani (Bartsch, 1947) TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, MAY, 2003 Family Pyramidellidae Boonea impressa (Say, 1822) Odostomia sp. A Sayella hemphillii (Dan, 1884) Sayella c£ laevigata (d’ Orbigny, 1842) Turbonilla c£ interrupta (Totten, 1835) Turbonilla c£ portoricana Dan and Simpson, 1901 Turbonilla sp. A Turbonilla sp. B Family Acteonidae Rictaxis punctostriatus (C.B. Adams, 1840) Order Cephalaspidea Family Cylichnidae Acteocina canaliculata (Say, 1826) Family Bullidae Bulla striata Bruguiere, 1792 Family Haminoeidae Haminoea antillarum (d’ Orbigny, 1841) TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, May 2003 xX (1uaas3 ‘D=) nuaasd sisdoiysisaD xX 4 xX X psojnayd vapiyi4ay xX SniupjJaquDI snanyjuv7) xX xX xX X unjjayrjnd unzav> wnpiiu wnzav7 X wnisD4yuod uordsng pypI4Is DYN 4 Duljiuau pjn3ng xX xX xX X 4 > 4 SnISvix8 SaJUOpIYIDIC xX Snurajid Sajuopiya0ig xX xX X vssasdui (piwojsopQ =) vauoog NINNIDA (wnung ‘Duojsviq=) wnjonng Xx xX xX pipuny (pyjasnpy=) siidisp »¢ >< xX SUDIPD.LU (uajzadinbay=) uajzado3up xajdwis pimoup ted (Snsaunaund y=) DUDIJAGND DIpsvrjDwoUuy xX Dg]D DIJUOpoUy xX DS4aASUD.] DADPOUP SIDAO DaDpouy xX pjp41sup4 siysoupy xX xX x pisddod wnjopsdwyp punispxa} Duasi)y xX DID]NIIDUDI DUuII0aj}Ip syonbap vaqy PA USUPIY «supe CundeyT Avg NSUYD sndiod aspew eundey] Aeg ysypay ed Ysypory UOIdoyY WOdYs0yY SatoedS Apmus wuasaig ($361) MUS (¢g61) 2UOLsNSeED (0861) (S261) (6961) (6561) 19410 uOsWeIy|I A, Jauyory = Aaueyp 2p ueuou7 SSS ~ K -K "SOTPNIS 94} JO JUO JsBa] Je Ul DoUepUNge YstY ul punoy saioads ase yuUd pjog ul exe] “SBXO] Ul SoIpNys snotaaid pur Apnys juasaid ay) ul spaq sseideos YIM poyeloosse punoy satoads ueosnijow jo uosuedwios °7 ajqe TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, MAY, 2003 xX x x x x x xX x xX x x x x x x xX X xX x x x x x x xX xX x xX xX xX xX X x x x X xX a, x xX x xX xX eg ysypay a2pew eq Aeg usuyd sndiod ampey eundey] Apms qasaig ($861) HMUS (£861) BUOI|suseED (0861) UOSWHENTI bq Ysypoy (S261) J3UyINYI (6961) AauryD 7 UeULOWUZ mm (6561) 124k Duypdy visuodT Dipuijzad (SapioovYy d=) DUuIINT DIJDIO14) DULIOINT IMOLIOM WINIPsDIIAIDT snsojjidod uoj1ysouy os] jupwpjo3 pAuuay Daui2ons DaounmD}Y WwiniD}]11UD DAOUIMIDLY Duwas vuMwan apuosiqaDy ‘JD Duo;sDUIjINT pjooydns wniuondyz sours SISUT Daadspiwas pjuopojdiq sinua} pjjaurjoAD sapiounjay piguiuny pupjd pjnpidaiD psojnopu pjnpida4) pipI1u40f vjnpidasD DxX2AuO? 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Davidson ABSTRACT Molluscan communities of two seagrass beds in Redfish Bay, Texas, were sampled November 2000-August 2001. One grassbed was heavily impacted by propeller scars (>20% of the area); the other site was only minimally impacted (<5%). All five seagrass species found in Texas were represented in the samples. Thalassia dominated the high impact site, whereas Thalassia and Halodule were codominants at the low im- pact site. Molluscan abundance patterns were determined to examine the possible impacts of scarring on these communities. Five transects were established at each site, within which thirteen core samples were taken seasonally (late fall 2000, early spring, early summer, and late summer 2001). A total of 26,498 mollusks were identified, representing 61 species and 35 families. Numerically, gastropods dominated all samples. Five gastropod species comprised 92.5% of total number of taxa collected: Cerithium lutosum (35.5%), Crepidula convexa (32.4%) Bittiolum vanum (10.00%) Boonea impressa 9.9%) and Sayella cf laevigata (4.7%). Dominant bivalves were Lucina pectinata (0.8%) and Mulinia lateralis (0.7%). Statistical analyses were performed on the seven most abundant species as well as on the ecological groups (epifauna, infauna, deposit feeders, suspension feeders, herbivores and predators). Analy- sis using Poisson regression demonstrated that seagrass biomass in- fluenced the abundance of C. /utosum, C. convexa, as well as the herbi- vore and epifaunal groups. Lucina pectinata was significantly more abun- dant at the low impact site. Boonea impressa was found in significantly higher densities at the high impact site, as were the deposit feeder and predator groups. Although there were differences between sites for some groups, propeller scarring did not appear to negatively affect the mollus- can community including the grassbeds. TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, MAY, 2003 Last year's winners of the Constance E. Boone Grants to Malacology were Mr. Andres Averbuj and Mr. Gregorio Bigatti, both from Buenos Aires, Argentina. Mr. Bigatti is working on the... Reproductive and Biological Aspects of the Ziczac Volutid Odontocymbiola magellanica (Gmelin, 1791) (Mollusca : Gastropoda) from Patagonia. Summary: Odontocymbiola magellanica is a volutid snail from Patagonia. Ithas a high economic potential, however, the lack of knowledge regarding its bidlogy indicates a real need for in-depth studies that can be used to develop a suitable management plan, ensuring this species continu- ance. With this project all the aspects of the reproductive biology and ecology of the volutid will be studied. The principal questions of this project are: 1) the identification of areas of greater abundance; 2) the analysis of the age structure of the snail population; 3) the identification of reproductive seasons; 4) reproductive rest seasons; 5) the character- ization of gonadic development stages; 6) the determination of imposex existence; 7) the determination of first sexual maturity and reproduction size; 8) sex ratios; 9) the establishment of embryonic development and toxicity analysis, all important in the development of a fisheries manage- ment plan. Mr. Averbuj's research concerns the Reproductive Ecology of endemic shallow water marine Gastropods with special attention to masculinization (Imposex) phenomenon, in Northern Argentina. A diversified endemic gastropod fauna inhabits the shallow waters (5- 10m) of the Province of Buenos Aires shelf. The ecology, reproductive strategies and dispersion are poorly known.This project includes the study of the reproductive cycle, embryonic nutrition and size and sex ratios of populations of several species. An Imposex focus was detected in several species of Gastropoda in the region of Mar del Plata. This 14 TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, May 2003 research includes the study of five common species in the area; Buccinanops monilifiler, Buccinanops duartei, Buccinanops gradatum, Olivancillaria deshayesiana and Olivancillaria urceus. Imposex is a response of gastropod females of certain species to the presence of TBT (Tributyltin) in the water and sediments. TBT has been used in anti-fouling paintings and was banned in the developed countries 20 years ago. This project is important to decide if the phenomenon of Imposex is restricted to the area of the Mar del Plata harbor or a more generalized problem in the Argentinean shelf. We will compare snail populations off Mar Chiquita (low impacted environment), to those off Mar del Plata (recorded focus of TBT pollution). David W. Hicks, Texas A&M University-Corpus Christi, Texas, was a recent winner of the Harold W. Harry Award for molluscan research. Reevaluation of the Status and Distribution of the Nonindigenous Brown Mussel, Perna perna, in the Southwestern Gulf of Mexico Populations of the nonindigenous brown mussel, Perna perna, reached maximum density and productivity rates on the shores of the southwest- ern Gulf of Mexico between 1992-1996. Since 1997, populations have waned presumably as a result of persistent unusually high summer wa- ter temperatures. However, as no monitoring efforts have been initiated during the past six years, the present status and distribution of P. perna must be considered unknown. This project proposes an investigation of the status and current distribution of this invasive species on Texas and Mexico Gulf of Mexico shores. TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, MAY, 2003 HOUSTON CONCHOLOGY SOCIETY, INC. Officers 2002-2003 President: Darwin G. Alder Vice-President Frank Petway Program Vice President: Tina Petway Field Trip Committee Harry Sharp Nancy Barziza John Zelko Treasurer: Angi Marsland Recording Secretary: Rachel Zelko Corresponding Secretary: Cathy Betley Auction Committee Cathy Betley Lucy Clampit Nancy Mustachio Mary Harris Darwin Alder Immediate Past President Cheryl Hood Co-Editor, Texas Conchologist John B. Wise Co-Editor, Texas Conchologist Darwin G. Alder Honorary Life Members Dr. Helmer Odé Dr. John B. Wise TEXAS CONCHOLOGIST Vol. XXXIX, No. 1, MAY, 2003 ITUTION LIBR RARIE wii | wih Table of Contents The The Texas Conchologist is getting a new A New Epitonium for Texas by Roe Davenpolt.................ccssccsssseccensccsneeeeasenees 1 Species Checklist of Mollusks in the Seagrass Meadows of Redfish Bay, Texas by Jennifer E. DavidSonn.................ccccssseceecenesenenes 3 Effects of Propeller Scarring on Molluscan Community Structure in Seagrass Meadows of Redfish Bay, Texas by Jennifer E. DavidSon................s:ssccsssssssseneeeees 13 Andres Averbuj: Constance E. Boone Grant................... 14 Gregorio Bigatti: Constance E. Boone Grant................-. 14 David W. Hicks : Harold W. Harry Awatd...........:ssssccee 15