Aspidosiphonidae Baird 1868
Creators: name: Silva-Morales, Itzahí
name: Gómez-Vásquez, Julio D.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Sipuncula
Phascolosomatidea
Aspidosiphoniformes
Aspidosiphonidae

description: Family Aspidosiphonidae
1. Hooks, if present, not in rings ....................................... Aspidosiphon (Akrikos) albus Murina, 1967
– Hooks in rings on the distal region of the introvert.........................................................................2
2. Longitudinal muscle layer divided into separate (or anastomosing) bundles ...................................... ................................................................................................ Aspidosiphon (Paraspidosiphon) ........3
– Longitudinal muscles in continuous layer (except under anal shield) ............................................... ..................................................................................................... Aspidosiphon (Aspidosiphon) ........7
3. Anal shield with grooves...................................................................................................................4
– Anal shield without grooves..............................................................................................................5
4. Papillae of anterior trunk scattered ..... Aspidosiphon (Paraspidosiphon) laevis de Quatrefages, 1865
– Papillae of anterior trunk in lines .............................. Aspidosiphon (Paraspidosiphon) cutleri sp. nov.
5. Compressed hooks bidentate, followed by dark pyramidal hooks ..................................................... ............................................................ Aspidosiphon (Paraspidosiphon) steenstrupii Diesing, 1859
– Compressed hooks bidentate, followed by pale pyramidal hooks....................................................6
6. Hooks bidentate, with streak vertical on the superior region ............................................................. .............................................................. Aspidosiphon (Paraspidosiphon) fischeri ten Broeke, 1925
– Hooks bidentate, with streak oblique on the superior region ............................................................. ............................................................................. Aspidosiphon (Paraspidosiphon) pastori sp. nov.
7. Individual units form into longitudinal ridges over dorsal half of anal shield .................................. ...................................................................... Aspidosiphon (Aspidosiphon) muelleri Diesing, 1851
– Without individual units that form into longitudinal ridges over dorsal half of anal shield.........8
8. All hooks unidentate; ill-defined anal shield ....................................................................................... ................................................... Aspidosiphon (Aspidosiphon) gracilis schnehageni Fischer, 1912
– Distal hooks bidentate; anal shield well-defined.............................................................................9
9. All compressed hooks bidentate, followed by dark conical hooks ..................................................... ............................................ Aspidosiphon (Aspidosiphon) elegans (Chamisso & Eysenhardt, 1821)
– Distal bidentate compressed hooks, followed by proximal unidentate ones..............................10
10. Gut helicoidal; lives in gastropod shells; anal shield units not tightly packed and of similar size ........................................................................ Aspidosiphon (Aspidosiphon) gosnoldi Cutler, 1981
– Gut coils loose or absent; does not occupy gastropod shells; anal shield more solid, with closeset, granular units of differing sizes ............. Aspidosiphon (Aspidosiphon) misakiensis Ikeda, 1904
description: Published as part of Silva-Morales, Itzahí & Gómez-Vásquez, Julio D., 2021, First records and two new species of sipunculans (Sipuncula) from the Southern Mexican Pacific, pp. 77-117 in European Journal of Taxonomy 740 (1) on pages 103-104, DOI: 10.5852/ejt.2021.740.1283, http://zenodo.org/record/4643194