Idanthyrsus sp.

Yanez-Rivera, Beatriz, Tovar-Hernandez, Maria Ana, Galvan-Villa, Cristian Moises & Rios-Jara, Eduardo, 2020, Tubicolous polychaete worms (Annelida) from Bahia de Chamela Islands Sanctuary, Mexico, with the description of a new bamboo worm, Biodiversity Data Journal 8, pp. 57572-57572: 57572

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Idanthyrsus sp.


Idanthyrsus sp.  

Idanthyrsus   sp. considered as new to science by Chávez-López 2019: 37-45, figs 9-10.


Type status: Other material. Occurrence: catalogNumber: LEMA-PO159; recordedBy: Irving Ramírez-Santana; individualCount: 6; Location: higherGeographyID: Pacific Ocean; higherGeography: Tropical Eastern Pacific; continent: America; islandGroup: Islas de Chamela; island: Isla Cocinas; country: México; countryCode: MX; stateProvince: Jalisco; municipality: La Huerta; minimumDepthInMeters: 3; maximumDepthInMeters: 4; verbatimLatitude: 19°32 ’57’’ N; verbatimLongitude: 105°06 ’20’’ W; Identification: identifiedBy: María Ana Tovar-Hernández; Event: samplingProtocol: Snorkel; eventDate: April 23, 2009; year: 2009; month: 4; day: 23; habitat: Rock; fieldNumber: Site 1; Record Level: language: Spanish; institutionID: Universidad de Guadalajara; collectionID: Colección Biológica del Laboratorio de Ecosistemas Marinos y Acuicultura; institutionCode: UDG; collectionCode: LEMA GoogleMaps  


Gregarious worms commonly known as "honey comb worms" (as well as I. cretus   and I. mexicanus   ). Tubes constructed with sea shells fragments (Fig. 8 View Figure 8 A). Complete specimens 14.1-14.5 mm long, 1.3-1.5 mm wide, with 26-32 abdominal chaetigers and a caudal peduncle 4-6 mm long. Body divided into four specialised regions: operculum, parathorax (with three segments), abdomen and caudal region where there is a long peduncle (Fig. 8 View Figure 8 B). Operculum composed by a crown and a peduncle, forming two not fused lobes (Fig. 8 View Figure 8 C). Outer paleae with straight blades basally, then slightly curved towards tips (Fig. 8 View Figure 8 F); lateral denticles long, narrow and straight, those from the distal area longer than basal half (Fig. 8 View Figure 8 F-G). Inner paleae with straight blades, transversal thecae not easily seen and pointed tips (Fig. 8 View Figure 8 H). Two nuchal hooks with limbate area in concave sides (Fig. 8E). Abdominal uncini with seven teeth in side view (Fig. 8 View Figure 8 D).


Found in colony mixed with Idanthyrsus cretus   .

Taxon discussion

Chávez-López (2019) recorded this species to Guerrero and Oaxaca and the formal description of the species is under construction ( Chávez-López pers. com. 2020). Specimen from Bahía de Chamela fits the description provided by Chávez-López (2019), except for the presence of inner paleae with pointed tips versus blunt by Chávez-López (2019). Judging from her Figure 9D, we considered that the tip is pointed instead of blunt. In addition, in her Figure 10G, an inner palea from a juvenile has a blunt tip, but it seems broken.