Table 1. Behavioral acts by males of Aegla longirostri, codes and descriptions. CodeBehaviorDescriptionNON-AGGRESSIVE ACTSWithout displacementWD1Without activityThe animal stands still, without moving its appendages, with the body near thesubstrate, chelipeds directed forwards (near the back) and fingers open, orchelipeds folded toward the cephalothorax, antennae directed forward, heldhorizontally parallel to the body axis (on chelipeds).WD2With activityThe animal moves the pereiopods constantly (leg waving) and/or chelipeds orantennae, always still; and keeps the chelipeds folded near the body and themaxillipeds in motion.With displacement (without real aggression)WKWalkingThe animal walks slowly in the arena, with the body near the substrate, antennaedirected forward, parallel to the body axis, chelipeds directed down, folded, notdirected forward, or else chelipeds towards the front and open. Sometimes theanimal brings the cheliped to the maxillipeds, and moves the appendices(antennae). This action is a way of exploring the arena.CAClimbing arenaThe animal makes an attempt with chelipeds, pereiopods, and abdomen to climb thearena walls. Antennae and chelipeds directed forward, chelipeds open, tailflips,and movement of pereiopods.AGGRESSIVE ACTSAPApproachingAn animal walks slowly toward the opponent; sometimes the antennae are directedforwards and are in motion.WAWalking awayThe animal slowly moves aside from the opponent, with abdomen directed toward theopponent, generally it goes to one of the corners of the arena. The animal walksaway while the other animal approaches, but this does not characterize escaping,because there is no signal of contact, only the approach of one animal leads theother to walk away.FFFace to faceThe animals remain still, face to face, one body length apart, antennae directed to thefront, chelipeds also directed to the front and very stretched, but sometimes thechelipeds move toward the maxilliped.To attack/the attack: when an animal chases its opponent and there is physical contact. The animals show the following behavioral postures during theperformance of the acts: chelipeds directed to the front, open and slightly raised; or chelipeds open and held high, antennae held perpendicular to theanimal’s body.HQHitting with chelipedsAn animal hits or ‘‘passes’’ with chelipeds on the opponent’s carapace or chelipeds.TOBeing touched with chelipedsWhen an animal is touched with the opponent’s chelipeds.PQPulling/pinching with chelipedsConsists of pressing and pulling quickly the cheliped (or the pereiopods) of theopponent. The animal tries to catch the opponent, but it cannot, during this act theantennae (generally) remain horizontal to the body.POBeing pulled with chelipedsWhen the animal is pulled by the opponent’s chelipeds, which may pull on both thechelipeds and pereiopods.CQHolding (catching) with chelipedsConsists of holding (catching) the opponent with chelipeds. Generally the part whichis held is the chelipeds of the other animal or even the pereiopods and antennae,and sometimes the animals try to catch the opponent’s cephalothorax.COBeing held (caught) with chelipedsWhen the animal is held by the opponent’s chelipeds, which may hold chelipeds,pereiopods, antennae, and even the cephalothorax of the other animal.WhAWhipping with antennaeThis is a quick below with the antennae toward the back of the body, and theopponent is behind the performer of the act.TATouch with antennaeConsists in touching the opponent quickly with the antennae; the opponent being nearthe front of the animal, the touch occurs both on the body and the antennae of theopponent (commonly observed during combat).DBPushing the opponent/displacing the bodyOne animal tries to displace the other pushing it with its own body (abdomen orcheliped).DOBeing pushed/ displaced by the opponent’s bodyWhen the animal is moved by being pushed by the opponent; the pushing isperformed with the chelipeds or even the abdomen.TODTurning the opponent upside downDuring the combat an animal turns the opponent over, leaving it with the ventral partof the body up.BTOBeing turned by the opponentWhen an animal is turned over by its opponent and remains with the ventral part ofthe body up.GOGoing up the opponentAn animal goes totally up over the opponent’s body, even when one of them isclimbing the arena.BCOBeing ‘‘climbed’’ by the opponentWhen an animal is ‘‘climbed’’ by the opponent.ChChasingAn animal chases (quickly approaching) the opponent, while the latter attempts toescape.FlFleeingThe animal attempts to flee, walking or climbing the arena. The opponent approachesand the animal escaping moves rapidly in another direction. In this act, the animalkeeps the antennae towards the front. One animal chases the other, which escapes,sometimes with subtle contacts (with chelipeds and/or antennae).

Published as part of Ayres-Peres, Luciane, Araujo, Paula B. & Santos, Sandro, 2011, Description Of The Agonistic Behavior Of Aegla Longirostri (Decapoda: Aeglidae), pp. 382 in Journal Of Crustacean Biology 31 (3) on page 382, DOI: 10.1651/10-3422.1, http://zenodo.org/record/7806409