Apionsoma (Edmondsius) pectinatum ( Keferstein, 1867 )

Gómez-Vásquez, Julio D., 2024, New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific, European Journal of Taxonomy 925, pp. 179-219 : 204-205

publication ID	https://doi.org/10.5852/ejt.2024.925.2463
publication LSID	lsid:zoobank.org:pub:699EAE25-96FC-4CD0-82D0-78F0C6E1B017
DOI	https://doi.org/10.5281/zenodo.10843965
persistent identifier	https://treatment.plazi.org/id/AD50BD48-FFB8-3E3C-FE48-2ECDFC7CFBEF
treatment provided by	Plazi (2024-03-15 12:18:36, last updated 2025-01-02 12:53:42)
scientific name	Apionsoma (Edmondsius) pectinatum ( Keferstein, 1867 )
status

Treatment

Apionsoma (Edmondsius) pectinatum ( Keferstein, 1867) View in CoL

Fig. 12A, C View Fig

Phascolosoma pectinatum Keferstein, 1867: 47–48 , pl. 6 figs 9–12 (type locality: Pacific of Panamá).

Siphonides rickettsi Fisher, 1952: 386–388 , pl. 22 (type locality: Punta Lobos, Espíritu Santo Island, Baja California Sur; under rocks; based on specimens reported in Steinbeck & Ricketts 1941 as Phascolosoma cf. gouldii ).

Phascolosoma cf. gouldii (not de Pourtalès, 1851) – Steinbeck & Ricketts 1941: 345 (Punta Lobos, Espíritu Santo Island, Baja California Sur; under rocks).

Phascolosoma (Edmondsius) pectinatum – Gibbs & Cutler 1987: 54–55 (establishment of the subgenus).

Apionsoma (Edmondsius) pectinatum View in CoL – Cutler 1994: 197–198 (generic transfer).

Material examined

MEXICO • 1 spec.; Nayarit, Banderas Bay, Manzanilla Beach , 20°44ʹ35ʺ N, 105°23ʹ14.8ʺ W; 26 Nov. 2004; depth 1 m; PSS et al. leg.; under rocks; ECOSUR-S0281 GoogleMaps .

Description ( ECOSUR-S 0281)

Trunk 10 mm in length; rough yellowish brown body wall ( Fig. 12A View Fig ); scattered mammillate papillae on trunk and introvert. Introvert four times as long as trunk, with twenty digitiform tentacles surrounding nuchal organ; with claw-like hooks with seven basal spinelets ( Fig. 12C View Fig ), 40 µm long, arranged in 40 complete rings.

Longitudinal musculature divided in anastomosing bands. Four retractor muscles, attached equally close to ventral nerve cord near anterior quarter of trunk, negating the appellations ventral and dorsal. A pair of bilobed nephridia, posterior lobe twice as long as anterior lobe; nephridiopores open posterior to anus. Spindle muscle attached anterior to anus; free intestine.

Habitat

Intertidal; under rocks.

Distribution

Eastern Pacific: from southern Gulf of California to Panamá.

Remarks

This specimen agrees with the original description in Keferstein (1867) and the redescription in Cutler (1994). Recently, Silva-Morales & Gómez-Vásquez (2021) recorded the species from the southern Mexican Pacific, including a brief discussion of its apparent disjunctive distribution in the Tropical Eastern Pacific. The record of this specimen offers a new location for its distribution in the Eastern Pacific and confirms its continuous distribution in the Mexican Pacific.

References

Cutler E. B. 1994. The Sipuncula, their Systematics, Biology, and Evolution. Cornell University Press, Ithaca, NY.

Fisher W. K. 1952. The sipunculid worms of California and Baja California. Proceedings of the United States National Museum 102 (3306): 371 - 450. Available from https: // www. biodiversitylibrary. org / page / 15672522 [accessed 26 Jan. 2024].

Gibbs P. E. & Cutler E. B. 1987. A classification of the phylum Sipuncula. Bulletin of the British Museum (Natural History), Zoology 52: 43 - 58. Available from https: // www. biodiversitylibrary. org / page / 2301577 [accessed 26 Jan. 2024].

Grube E. 1858. Annulata Orstediana. Videnskabelige Meddelelser fra Dansk naturhistorisk Forening i Kjobenhavn for 1858: 105 - 120. Available from https: // www. biodiversitylibrary. org / page / 35800298 [accessed 26 Jan. 2024].

Keferstein W. 1867. Untersuchungen uber einige amerikanische Sipunculiden. Zeitschrift fur wissenschaftliche Zoologie 17: 44 - 55. Available from https: // www. biodiversitylibrary. org / page / 45007321 [accessed 26 Jan. 2024].

Silva-Morales I. & Gomez-Vasquez J. D. 2021. First records and two new species of sipunculans (Sipuncula) from the Southern Mexican Pacific. European Journal of Taxonomy 740: 77 - 117. https: // doi. org / 10.5852 / ejt. 2021.740.1283

Steinbeck J. & Ricketts E. F. 1941. Sea of Cortez. A Leisurely Journal of Travel and Research. Viking Press, New York.

Figures

Fig. 12. Phascosolomatids. A, C. Apionsoma (Edmondsius) pectinatum (Keferstein, 1867 (ECOSUR- S0281). A. Lateral overview, introvert partially contracted.C. Hook.B, D. Phascolosoma (P.) puntarenae Grube & Öersted in Grube, 1858 (UMAR-SIPU 138). B. Lateral overview, introvert contracted. D. Hook. Scale bars: A–B = 5 mm; C = 20 µm; D = 40 µm.