Aglaophamus fabrun, Franco, Natália Bizzo & Rizzo, Alexandra E., 2016
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publication ID |
https://doi.org/ 10.11646/zootaxa.4114.3.5 |
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publication LSID |
lsid:zoobank.org:pub:79781290-DD73-46AD-921F-87ED8A573C36 |
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DOI |
https://doi.org/10.5281/zenodo.6055861 |
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persistent identifier |
https://treatment.plazi.org/id/038487A9-D637-4772-FF6D-930FFBB300DD |
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treatment provided by |
Plazi |
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scientific name |
Aglaophamus fabrun |
| status |
sp. nov. |
Aglaophamus fabrun View in CoL sp. nov.
Figure 3 View FIGURE 3 (A–E); Figure 8 View FIGURE 8 (A–D)
Type material. 11 specimens: HABITATS: Continental Shelf: Holotype: UERJ 5823 (HAB.17 E1R2, no data); Paratypes: UERJ 4968 (7 spec., HAB.17 E1R2, no data); UERJ 4967 (2 spec., 22º8’4.960’’S and 040º27’33.740’’W, HAB.16 E3R1, 65 m), UERJ 4969 (1 spec., 22º7’38.970’’S and 040º18’52.510’’W, HAB.16 F3R3, 73 m).
Diagnosis. Proboscis with 10 pairs of distal papillae, circa 20 subdistal papillae in rows, each row with 3–5 papillae, and unpaired median papilla absent; prostomium with characteristic pigmentation pattern, a central spot, a pair of small eyes, and another pair embedded on anterior segments (fourth parapodium).
Description. Specimens ranging from 5–22 mm long and 0.6–1 mm wide; with 12–69 chaetigers; some specimens incomplete. Description based on the complete holotype (UERJ 5823) in three parts, with 73 chaetigers, 21.5 mm long, and 0.8 mm wide (excluding chaetae). Body long and slender. Prostomium with anterior and lateral edges slightly rounded; small spot on dorsal central portion ( Figure 3 View FIGURE 3 A–B). Frontal pair of antennae and ventral pair of palps present. One pair of small subdermal eyes ( Figure 3 View FIGURE 3 B) located at base of first chaetiger, near posterolateral edge of prostomium, and another pair embedded on anterior segments (fourth parapodium), occasionally not visible (when stained) ( Figure 3 View FIGURE 3 B). Proboscis with 10 pairs of distal papillae; circa 20 rows, each row with 3-5 subdistal papillae. Pair of rounded nuchal organs situated on first chaetiger. First parapodia well delimited, rudimentary and positioned frontally ( Figure 3 View FIGURE 3 A–B); dorsal and ventral cirri short, slender and rudimentary, as are notopodial and neuropodial lobes. Ventral mouth opening occupying chaetigers 1 to 3. Interramal branchiae curved inward, present from chaetiger 3 ( Figure 3 View FIGURE 3 C–E); decreasing in size toward posterior region until they disappear in final portion of body. Notopodial and neuropodial preacicular lobes rounded, underdeveloped; acicular lobe small and pointed, slightly larger than preacicular; postacicular lobe larger than others, rounded, well developed and translucent ( Figure 3 View FIGURE 3 C–E). Notopodia less developed than neuropodia. Dorsal cirri slender, short; ventral cirri conical and developed, but short ( Figure 3 View FIGURE 3 C–E). Space between notopodia and neuropodia decreases gradually toward posterior chaetigers. Notopodial and neuropodial preacicular chaetae of three kinds: short and barred ( Figure 8 View FIGURE 8 B), short and flattened ( Figure 8 View FIGURE 8 C), and short and serrulate; postacicular chaetae from middle of body of two kinds: long and serrulate ( Figure 8 View FIGURE 8 D), and long capillary ( Figure 8 View FIGURE 8 A). Lyrate chaetae present on all parapodia, but in larger numbers from middle region. Pygidium rounded, small, with short pygidial cirrus.
Remarks. The new species resembles Aglaophamus uruguayi Hartman, 1953 , from Uruguay: both have a pair of subdermal eyes on the posterior margin of the prostomium, the proboscis with 20 rows of subdistal papillae, and chaetae of the same type. In A. uruguayi the rows of subdistal papillae contain 6 to 9 papillae each, a middorsal unpaired papilla is present, and the interramal branchiae start from chaetiger 4. Unlike the other species described from Brazil, Aglaophamus fabrun sp. nov. has the proboscis with 20 subdistal papillae in rows of 3–5, and lacks an unpaired median papilla; also, the prostomium has characteristic pigmentation, with a central dorsal spot, a feature not present in other Brazilian species of this genus. The nervous system appears as two small dark subdermal eyes located at the basis of chaetiger 4, but cannot be seen in all specimens, especially when they are stained and /or juveniles.
Etymology. The species name “ fabrun ’ is dedicated to Fatima Lobôsco Bizzo (“ fa ”) and Bruno Bizzo Franco (“ brun ”), respectively, the mother and brother of the first author, combining the first letters of each name. Distribution. Known only from the Campos Basin, Brazil, in depths of 65– 73 m.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.