Childia crassum Westblad 1942

• Main Authors: Hooge, Matthew D., Tyler, Seth
• Format: Text
• Language: unknown
• Published: Zenodo 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Xenacoelomorpha; Acoelomorpha; Acoela; Childiidae; Childia; Childia crassum; Norway; North Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.6231356; https://zenodo.org/record/6231356

Childia crassum (Westblad, 1942) (Figs. 1 A, B) Paraphanostoma crassum : Westblad 1942 (p. 14); Westblad 1948 (p. 23); Marcus 1950 (p. 427); Westblad 1954 (p. 4); Marcus 1954 (p. 427); Riedl 1956 (p. 89); Dörjes 1968 (p. 112); Dörjes and Karling 1975 (p. 183); Lauckner 1980 (p. 292); Reuter et al. 2001 (p. 122); Raikova et al. 2004 (p. 72). Childia crassum : Tekle et al. 2005 (p. 73); Raikova et al. 2006 (p. 220). Material . Living specimens in squeeze preparations, whole mounts for fluorescence imaging of musculature. Localities . Pond Sock Reef (9 ° 17 ’ 17.9 ” N, 82 ° 19 ’ 39.9 ” W), from fine-grained sand at 2 m depth collected from sediment surrounding a sunken boat; Isla Colon, Mangrove Inn (9 ° 19.870 ’ N, 82 ° 15.286 ’ W), from fine-grained sand at 3–4 m water depth. Description . Mature specimens ~ 650 µm long and ~ 160 µm wide (Fig. 1 A). Anterior end rounded; posterior sometimes somewhat pointed. Body without conspicuous coloration. Body-wall musculature with longitudinal fibers positioned outside of circular fibers. Ventral musculature with U 1 and U 2 muscles (sensu Tekle et al. 2005): muscles that are longitudinally oriented in the anterior half of body and wrap around posterior rim of mouth, and modified circular muscles whose mid-points line the posterior rim of the mouth and whose lateral extensions are positioned anterior to the mouth (data not shown). Separate male and female gonopores. Male copulatory organ with fine penis stylets in cone-shaped arrangement (Fig. 1 B). Remarks . Prior to this collection, Childia crassum was known only from the Eastern North Atlantic Ocean (see Tyler et al. 2006). Our specimens were approximately half the length of those originally described by Westblad (1942), with correspondingly smaller internal structures. Members of the genus Childia have species-specific patterns of body-wall musculature, and our specimens matched that described for C. crassum (see Tekle et al. 2005). : Published as part of Hooge, Matthew D. & Tyler, Seth, 2008, Acoela (Acoelomorpha) from Bocas del Toro, Panama, pp. 1-40 in Zootaxa 1719 on pages 3-4, DOI: 10.5281/zenodo.181066 : {"references": ["Westblad, E. (1942) Studien uber skandinavische Turbellaria Acoela. II. Arkiv for Zoologi, 33 A, 1 - 48.", "Westblad, E. (1948) Studien uber skandinavische Turbellaria Acoela. V. Arkiv for Zoologi, 41 A, 1 - 82.", "Marcus, E. (1950) Turbellaria Brasileiros (8). Boletins da Faculdade de Filosofia, Ciencias e Letras Universidade de Sao Paulo Zoologia, 15, 5 - 192.", "Westblad, E. (1954) Some Hydroidea and Turbellaria from Western Norway with description of three new species of Turbellaria. Publications from the Biological Station 11, 1 - 24.", "Marcus, E. (1954) Turbellaria Brasileiros (11). Papeis Avulsos Departamento de Zoologia Secretaria da Agricultura Sao Paulo, 11, 419 - 489.", "Riedl, R. J. (1956) Zur Kenntnis der Turbellarien adriatischer Schlammboeden sowie ihre goegraphische und faunistische Beziehung. Thalassia Jugoslavica, 1, 69 - 180.", "Dorjes, J. (1968) Die Acoela (Turbellaria) der deutschen Nordseekuste und ein neues System der Ordnung. Zeitschrift fr Zoologische Systematik und Evolutionsforschung, 6, 56 - 452.", "Dorjes, J. & Karling, T. G. (1975) Species of Turbellaria Acoela in the Swedish Museum of Natural History, with remarks on their anatomy, taxonomy and distribution. Zoologica Scripta, 4, 175 - 189.", "Lauckner, G. (1980) Diseases of Platyhelminthes. In: O. Kinne (Ed) Diseases of marine animals, Vol 1. General aspects, Protozoa to Gastropoda, New York, John Wiley & Sons, 279 - 302.", "Reuter, M., Raikova, O. I., Jondelius, U., Gustafsson, M. K. S. & Maule, A. G. (2001) Organisation of the nervous system in the Acoela: An immunocytochemical study. Tissue & Cell, 33, 119 - 128.", "Raikova, O. I., Reuter, M., Gustafsson, M. K. S., Maule, A., Halton, D. W. & Jondelius, U. (2004) Evolution of the nervous system in Paraphanostoma (Acoela). Zoologica Scripta, 33, 71 - 88.", "Tekle, Y. I., Raikova, O. I., Ahmadzadeh, A. & Jonelius, U. (2005) Revision of the Childiidae (Acoela), a total evidence approach in reconstructing the phylogeny of acoels with reversed muscle layers. Journal of Zoological Systematics and Evolutionary Research, 43, 72 - 90.", "Raikova, O. I., Tekle, Y. I., Reuter, M., Gustafsson, M. K. S. & Jondelius, U. (2006) Copulatory organ musculature in Childia (Acoela) as revealed by phalloidin fluorescence and confocal microscopy. Tissue & Cell, 38, 219 - 232."]}