Jasmineira gustavoi, Capa, María & Murray, Anna, 2015

Capa, María & Murray, Anna, 2015, A taxonomic guide to the fanworms (Sabellidae, Annelida) of Lizard Island, Great Barrier Reef, Australia, including new species and new records, Zootaxa 4019 (1), pp. 98-167 : 121-125

Jasmineira gustavoi n. sp.

( Figs 9–10 )

Material examined. Queensland, Lizard Island: Holotype: AM W.43875, MI QLD 2333 (in 2 pieces). Paratypes: AM W.47334, MI QLD 2444 (2).

Other material examined. Queensland, Heron Island: AM W.41162, AM W.41171, AM W.41172, North Wistari Reef, 23°27′07′′S, 151°52′02′′E, coral rubble, 12.5 m, 11 Nov 2009; AM W.39512 (on SEM), AM W.47335, Sykes Reef, 23°25′57′′S, 151°02′02′′E, coral rubble, 30 m, 14 Nov 2009; AM W.41165, Lamont reef, 23°36′08′′S, 152°03′02′′E, coral rubble, 15 m, 19 Nov 2009; AM W.41166, First Point, 23°25′56′′S, 151°56′02′′E, coral rubble, 13 m, 12 Nov 2009; AM W.41169, “Twin Peaks” fore-reef, 23°28′20′′S, 151°57′02′′E, algae, 13 m, 13 Nov 2009.

Description. Holotype with body 5 mm long, crown 3 mm long, 0.6 mm maximum wide, eight thoracic and 26 abdominal chaetigers. Live specimens are whitish-translucent with orange radiolar crown and bright orange-yellow gut, at least along the thoracic and mid anterior abdominal chaetigers ( Fig. 9 A–B). Two large, red peristomial eyes present ( Fig. 9 C). Preserved specimens whitish, opaque, with no pigment in radiolar crown or body, only the peristomial eyes, brown after fixation, remain. Specimens fixed in 100% ethanol and stained with methyl green show pronounced single transverse bands in each segment of the ventral thorax and abdomen, stronger staining on the thoracic ventral shields, with the distal rim of the crenulated collar remaining unstained, as well as the dorsum of the thorax ( Fig. 9 D–F). Radiolar crown with semicircular lobes each with 10 radioles, with pinnules all similar in length ( Figs 9 A–C, 10A, D). Four pairs of ventral radiolar appendages. Dorsal and ventral basal flanges absent. Basal membrane reduced, radiolar flanges absent ( Fig. 9 A–C). Two rows of vacuolated cells supporting radioles basally. Radiolar eyes absent. Dorsal lips rounded, without dorsal radiolar appendages, pinnular appendages absent. Ventral lips and parallel lamellae present, ventral sacs absent. Posterior peristomial ring collar with dorsal margins fused to faecal groove, similar in height all around, with crenulated anterior margin, and ventrally separated by a midventral incision half the length of collar ( Figs 9 D–E, 10A–D). Narrow glandular ridge around chaetiger 2 ( Fig. 9 D–E). Thoracic ventral shields not conspicuous ( Fig. 9 D). Interramal eyespots absent. Collar chaetae narrowly-hooded arranged in oblique rows ( Fig. 10 E). Following thoracic chaetigers with slightly elevated notopodia narrowly-hooded superior chaetae, paleate inferior chaetae with long mucro and an additional anterior row of bayonet chaetae ( Figs 9 G, 10F–G). Thoracic neuropodial uncini acicular, with more than five rows of teeth diminishing in size posteriorly, covering half the length of main fang; basal row with three larger teeth ( Figs 9 H, 10H–I). Companion chaetae absent. Abdominal chaetigers with inconspicuous neuropodia with elongate, narrowly-hooded chaetae ( Fig. 10 J). Abdominal uncini avicular, elongated, with five rows of similar-sized teeth, occupying half the length of main fang; reduced breast and medium-length handle ( Figs 9 I–K, 10K). Pre-pygidial abdominal depression absent ( Fig. 9 A, F). Pygidium conical, with a cirrus as long as five chaetigers, pygidial eyespots not seen ( Fig. 9 L). Tube not observed.

Pairsof Pairs of rad. Collar Collar Collar Collar Bayonet Vascular Abdominal Pygidial radioles appendages lateral midventral ventral lappets anterior chaetae loops chaetigers cirrus

incisions incisions margin

. analis Ehlers, 1908 3 3 present present elongate??? 7–15?

. bermudensis Hartman, 1965?? absent absent (?) absent? present? 31?

. reayi ( McIntosh, 1916) ? 4??? crenulated present present??

. regularis Hartman, 1978 5? absent present low, rounded??? 24–28?

. schaudinni Augener, 1912** 12-16? absent absent long, rounded smooth present present 46–67 present

. gustavoi n. sp. 10 4 absent present absent crenulated present reduced 17 present Probably not a Jasmineira

Examination of specimens from NTNU University Museum, Trondheim (NTNU VM 23890), identified by P. Knight-Jones.

Variation. All the specimens collected, except for the holotype, had radioles broken off at the abscission plane, near the base of the crown, so the variation in the number of radioles, ventral radiolar appendages and other radiolar structures is awkward to assess, as is the variation of the total length of the specimens. Body length varies from 3–5 mm. Other features as described in holotype.

Remarks. Of the 17 species of Jasmineira considered as valid up to date ( Table 3), 12 are characterised by possessing a posterior peristomial ring incised midventrally (for two additional species this information is unknown), but of these, only four lack ventral lappets on the ventral margins of collar (for two species this information is unknown), and only one of them has been described with a crenulated anterior margin of the collar, Jasmineira reayi ( McIntosh, 1916) , described from Ireland. Jasmineira gustavoi n. sp. and J. reayi are distinguished by several morphological attributes: J. reayi was described as possessing inferior thoracic chaetae with medium-sized mucro ( Tovar-Hernández 2007b), whereas the new species has a very long mucro compared with other described Jasmineira species (e.g. Fitzhugh 2002), and J. reayi bears three rows of teeth over main fang on thoracic uncini whereas this new species bears around five. Other diagnostic features, such as the presence of a pygidial cirrus, could not be compared between the two species as the description of J. reayi lacks these details.

Etymology. This graceful species is dedicated to Gustavo Capa. He participated in the fieldwork as part of the Lizard Island Polychaete Workshop 2013 and was of good help in the laboratory despite his six years of age. Sabellids are, because of their beauty, his preferred polychaetes and yellow his favourite colour.

Habitat. Muddy sand, sand and Halophila seagrass, from 9 to 24 m depth.

Type locality. Lizard Island.

Distribution. Australia (Queensland: Lizard and Heron Islands).

Figures

FIGURE 9. Jasmineira gustavoi n. sp. A – B. Live specimen. A. Whole individual, lateral view; B. Detail of anterior end, showing conspicuous peristomial eyes; C. Preserved specimen, with a clear abscission plane, where radioles detach deliberately from the base of crown; D – F. Specimen stained with methyl blue; D. Anterior end, ventral view, showing anterior margin of collar incision and transverse divisions of segments, glandular ridge on chaetiger 2 is visible (arrow); E: Same, dorsal view, showing collar margins fused to faecal groove; F. Posterior end, ventrolateral view; G. Thoracic chaetae, superior narrowly-hooded, inferior broadly-hooded; H. Thoracic uncini acicular, with rows of teeth above main fang for half its length; I. Anterior abdominal uncini avicular, with long necks, and with rows of teeth; J. Drawing, anterior abdominal uncinus; K. Drawing, posterior abdominal uncinus. Photographs: D – F by Eunice Wong.

FIGURE 10. Jasmineira gustavoi n. sp., scanning electron micrographs. A. Radiolar crown broken at abscission plane and collar with anterior margin crenulated and midventral incision; B. Same, dorsal view, with dorsal collar margins fused to faecal groove; C. Same lateral view, glandular ridge on chaetiger 2 visible (arrow); D. Frontal view of radiolar crown showing the abscission plane and anterior margin of collar crenulated; E. Collar chaetae narrowly hooded; F. Midthoracic parapodium with narrowly-hooded superior chaetae, paleate inferior chaetae with long mucro and an additional anterior row of bayonet chaetae (arrow); G. Detail of inferior thoracic chaeta; H. Thoracic uncini with more than five rows of teeth diminishing in size distally, covering half the length of main fang. I. Same, top view; J. Midabdominal chaetae, narrowly-hooded; K. Midabdominal uncini with five rows of similar-sized teeth, occupying half the length of main fang; L. Posterior abdominal chaetiger and pygidium, with a pygidial cirrus.