Branchiomma coheni, Tovar-Hernández & Knight-Jones, 2006

Tovar-Hernández, María Ana & Knight-Jones, Phyllis, 2006, Species of Branchiomma (Polychaeta: Sabellidae) from the Caribbean Sea and Pacific coast of Panama, Zootaxa 1189 (1), pp. 1-37 : 24-27

publication ID

https://doi.org/ 10.11646/zootaxa.1189.1.1

publication LSID

lsid:zoobank.org:pub:B57B9D66-6191-4BFE-A17D-9CA97CEF4C7D

persistent identifier

https://treatment.plazi.org/id/03818780-A40F-FFC6-FEEC-FB9BFD48FA45

treatment provided by

Felipe

scientific name

Branchiomma coheni
status

sp. nov.

Branchiomma coheni sp. nov.

Figures 6A–M View FIGURE 6 , 8A View FIGURE 8 , 9E–G View FIGURE 9 , 10D View FIGURE 10 , 11C View FIGURE 11

Material examined

Type material: Holotype [ LACM­AHF POLY 2131 ] Panama, Punta Culebra , Naos, 08° 54.7’ N, 79° 31.8’ W, LH02­688E, Coll. L. Harris, Apr. 30, 2002 from intertidal area of large boulders and rocks buried in sand and associated tide pools, with smaller rocks often with smooth, tough sponge on sides and bottom GoogleMaps . Paratypes [ LACM­AHF POLY 2132 ] (4), [ LACM­AHF POLY 2133 ] (3), [ ECOSUR 0051 View Materials ] (1), sample location and date as for holotype .

Non­type material: NW Australia, Original material B. galei ( Augener, 1914: fig. 16, pt. 1, figs 16–17 as Dasychone ) [ZMUH V8281, PK­J]. New Material [MAT­H]: Panama [ECOSUR] Gatun Locks, Balboa, Coll. S. I. Salazar, May 28, 2002, intertidal (5); Balboa Yacht Club, 08° 56.3’ N, 79° 33.3’ W, Coll. S. I. Salazar, May 30, 2002, intertidal (4); Fuerte Rodman, Balboa, Coll. S. I. Salazar, May 31, 2002, intertidal (28); Diablo Spinning Club, Balboa, 08° 57.8’ N, 79° 34.2’ W, Coll. S. I. Salazar, June 5, 2002, intertidal (30); May 30, 2002, intertidal (15). [LACM­AHF] Punta Culebra, Naos, 08° 54.7’ N, 79° 31.8’ W, LH02­688E, Coll. L. Harris, Apr. 30, 2002 (1); Balboa Yacht Club, 08° 56.3’ N, 79° 33.3’ W, LH02­637E; Coll. L. Harris, May 30, 2002 (1); Diablo Spinning Club, Balboa, 08° 57.8’ N, 79° 34.2’ W, LH02­678E, Coll. L. Harris, Apr. 30, 2002 (1).

Description

The following description is based mainly on the holotype with data in parentheses for the paratypes.

Specimens large, with body without crown 17 mm long, thorax 3 mm long, 4.5 mm wide (3–4.5). Body green mottled with small brown spots ( Figs 6A–B View FIGURE 6 ), and interramal dark spots, larger on first thoracic segments and smaller in posterior region. Radiolar crown long (half of the body length), 9 mm length, united at the base by short web or membrane, with longitudinal bands of dark brown spots below each web. About 25 pairs (20–28) of radioles, each banded with green olive bands (occupying space of three pinnules). Bands dark brown in some specimens and one orange band between each pair of eyes, only from the median region of the crown to the anterior end. Radioles with apinnulate tips, as long as equivalent space of two pinnules ( Fig. 6F View FIGURE 6 ). Basal stylode unpaired, medium length, tongue­like, as wide as rachis. Stylodes: 15 pairs [s, s, s, s, M, M, L, L, L, L, L, L, L, s, s]. Stylodes with fairly even gradation of length along radiole (macrostylodes absent); basal pairs tongue­like ( Figs 9F–G View FIGURE 9 ), more distal pairs of stylodes wider subdistally, sometimes rounded, sometimes bilobed ( Fig. 5F–G View FIGURE 5 ) or with very uneven distal margins ( Fig. 9G View FIGURE 9 ). Each new pair of stylodes (near tip of radiole) digitiform and showing asymmetric development ( Fig. 6G View FIGURE 6 ). Eyes not present between last pair of stylodes, otherwise eyes small, with those from medial and distal regions surrounded by accumulation of pigment cells ( Fig. 6F View FIGURE 6 ); lenses cone­shaped. Dorsal lips long, one half length of radioles, triangular with a distinct orange longitudinal ridge (mid­rib), lateral margin olive­green. Transverse section of dorsal lip showing numerous supporting cells of radiolar appendage (mid­rib), flanked by lamellae; these with blood vessels, without surrounding sheath ( Fig. 6E View FIGURE 6 ). Midline faecal groove deep on first segment forming mounds each side ( Fig. 6A View FIGURE 6 ). Collar well separated dorsally, with ventral lappets rounded, full overlapped ( Figs 6B View FIGURE 6 , 8A View FIGURE 8 ), each one with a big orange spot. Thorax with eight segments. Thoracic tori extending to sides of brown trapezoidal ventral shields. Collar chaetae slender, weakly geniculate ( Fig. 6H View FIGURE 6 ), arranged in compact fascicles. Thoracic notochaetae arranged within each fascicle in irregular, oblique rows of superior and inferior chaetae ( Fig. 10D View FIGURE 10 ); each superior chaeta slender, weakly geniculate ( Fig. 6J View FIGURE 6 ), with knee region slightly wider than shaft; whereas inferior chaetae with knee up to twice as wide as shaft ( Fig. 7K View FIGURE 7 ). Avicular uncini with the crest surmounted by two rows of teeth (side view), occupying one quarter of the crest with three teeth in anterior row and two smaller ones in next row ( Fig. 11C View FIGURE 11 ), and manubrium short ( Fig. 6C View FIGURE 6 ). Abdomen with 49 segments (38–86). Tori smaller than those in thorax. Most fascicles of abdominal chaetae forming compact tufts, with outer chaetae geniculate ( Fig. 6L View FIGURE 6 ), arranged in a thick Cshaped arc around a cluster of capillary chaetae ( Fig. 6M View FIGURE 6 ). Abdominal uncini with short straight manubrium ( Fig. 6D View FIGURE 6 ). Pygidium bilobed. Tube of one paratype containing three small tanaid tubes.

Remarks

Branchiomma coheni clearly differs from B. nigromaculatum , B. bairdi , B. conspersum , and B. curtum , which have either intermittent macrostylodes on the distal half of the radiole or just digitiform stylodes throughout the radiole length. The broad stylodes of B. coheni form a fairly even gradation in size thoughout the length of the radiole as in other Group F species. Branchiomma coheni most closely resembles B. galei ( Augener, 1914: fig. 16, pt. 1, figs 16 and 17 as Dasychone ) of the species in that group. Augener’s type material shows a more even gradation of stylode length throughout the radiole than indicated by his figure (PK­J, pers. obs). B. galei has mainly long broad stylodes, with sides more or less parallel, particularly between the median and subdistal areas of the rachis. The sides of the stylodes of B. coheni , however, rapidly widen towards the tips, giving a foliose appearance somewhat like B. infarctum ( Krøyer, 1856, redescribed by Knight­Jones, 1994) and B. natalensis ( Kinberg, 1867, as Sabella ) (PK­J, pers. obs). Branchiomma infarctum and B. natalensis differ from B. coheni in having thoracic uncini with numerous rows of crest teeth (characteristic of Group E). Another Branchiomma species , with foliose stylodes (and thoracic uncini with numerous crest teeth), is B. violacea Schmarda (1861 , as S abella, Cape of Good Hope, South Africa, but this species also differs from B. coheni in having a bispiral crown and the dorsal collar fused to the sides of the midline faecal groove (Group A).

Type locality Punta Culebra , Naos, Panama, 08° 54.7’ N, 79° 31.8’ W GoogleMaps .

Distribution Pacific coast of Panama.

Etymology

This species is named in honour of Dr. Andrew Cohen (San Francisco Estuary Institute), who made possible this expedition to the Panama Channel, and in recognition of his work in biological invasions.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Sabellidae

Genus

Branchiomma

Loc

Branchiomma coheni

Tovar-Hernández, María Ana & Knight-Jones, Phyllis 2006
2006
Loc

Branchiomma coheni

Tovar-Hernández & Knight-Jones 2006
2006
Loc

B. coheni

Tovar-Hernández & Knight-Jones 2006
2006
Loc

Branchiomma coheni

Tovar-Hernández & Knight-Jones 2006
2006
Loc

B. coheni

Tovar-Hernández & Knight-Jones 2006
2006
Loc

B. coheni

Tovar-Hernández & Knight-Jones 2006
2006
Loc

B. coheni

Tovar-Hernández & Knight-Jones 2006
2006
Loc

Dasychone

Sars 1862
1862
Loc

B. violacea

Schmarda 1861
1861
Loc

Sabella

Linnaeus 1767
1767